Microcontroller and control device
AssigneeNuvoton Technology Corporation
InventorYung-Chi Lan
Life of this patent
Estimating the term…
Abstract
A control device coupled to an oscillator circuit and including a first output circuit, a synchronizer circuit, a hysteresis circuit, a stable circuit, and a second output circuit is provided. The first output circuit activates an oscillator circuit according to an activation signal so that the oscillator circuit generates an input clock. The synchronizer circuit synchronizes the activation signal to generate a synchronization signal. The synchronization signal is synchronized with the input clock. The hysteresis circuit directs the first output circuit to disable the oscillator circuit according to the synchronization signal. The stable circuit enables a transmission signal according to the input clock. When the transmission signal is enabled, the second output circuit uses the input clock as an output clock.
Claims20
A control device coupled to an oscillator circuit, comprising:
- a first output circuit enabling a driving signal in response a first activation signal being at a first level, and disabling the driving signal in response to a first clear signal being enabled;
- a synchronizer circuit synchronizing the first activation signal to generate a synchronization signal, wherein the synchronization signal is synchronized with an input clock;
- a hysteresis circuit enabling the first clear signal in response to a level of the synchronization signal matching a first predetermined state, and enabling a second clear signal in response to the level of the synchronization signal matching a second predetermined state;
- a stable circuit enabling a transmission signal according to the input clock;
- and
- a second output circuit using the input clock as a first output clock in response to the transmission signal being enabled, and stopping the use of the input clock as the first output clock in response to the second clear signal being enabled,
- wherein:
- in response to the driving signal being enabled, the oscillator circuit provides the input clock, and
- in response to the driving signal being disabled, the oscillator circuit stops providing the input clock.
A microcontroller circuit comprising:
- an oscillator circuit providing an input clock in response to a driving signal being enabled, wherein in response to the driving signal being disabled, the oscillator circuit stops providing the input clock;
- and
- a control device coupled to the oscillator circuit and comprising:
- a first output circuit enabling the driving signal in response to a first activation signal being at a first level and disabling the driving signal in response to a first clear signal being enabled;
- a synchronizer circuit synchronizing the first activation signal to generate a synchronization signal, wherein the synchronization signal is synchronized with the input clock;
- a hysteresis circuit enabling the first clear signal in response to a level of the synchronization signal matching a first predetermined state, and enabling a second clear signal in response to the level of the synchronization signal matching a second predetermined state;
- a stable circuit enabling a transmission signal according to the input clock;
- a second output circuit using the input clock as a first output clock in response to the transmission signal being enabled, and stopping the use of the input clock as the first output clock in response to the second clear signal being enabled.
Dependencies are inferred from the claim text.